diff --git a/src/apprt/gtk/class/application.zig b/src/apprt/gtk/class/application.zig
index 0a336fd79..6a07cab84 100644
--- a/src/apprt/gtk/class/application.zig
+++ b/src/apprt/gtk/class/application.zig
@@ -2406,7 +2406,7 @@ const Action = struct {
 
                 // If the tree has no splits (only one leaf), this action is not performable.
                 // This allows the key event to pass through to the terminal.
-                if (!tree.isSplit()) return false;
+                if (!tree.getIsSplit()) return false;
 
                 return tree.resize(
                     switch (value.direction) {
@@ -2564,7 +2564,7 @@ const Action = struct {
 
                 // If the tree has no splits (only one leaf), this action is not performable.
                 // This allows the key event to pass through to the terminal.
-                if (!tree.isSplit()) return false;
+                if (!tree.getIsSplit()) return false;
 
                 return surface.as(gtk.Widget).activateAction("split-tree.zoom", null) != 0;
             },
diff --git a/src/apprt/gtk/class/split_tree.zig b/src/apprt/gtk/class/split_tree.zig
index 8d859adca..0ff7e6044 100644
--- a/src/apprt/gtk/class/split_tree.zig
+++ b/src/apprt/gtk/class/split_tree.zig
@@ -561,7 +561,7 @@ pub const SplitTree = extern struct {
         ));
     }
 
-    fn getIsSplit(self: *Self) bool {
+    pub fn getIsSplit(self: *Self) bool {
         const tree: *const Surface.Tree = self.private().tree orelse &.empty;
         if (tree.isEmpty()) return false;